JP2008204059A - Workpiece deformation computing device and workpiece deformation computing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a workpiece deformation computing device which can compute deformation of a workpiece, while reducing time required for analysis by suppressing a computation load accompanying the analysis. <P>SOLUTION: The workpiece deformation computing device has: a setting means for setting mutually different first to third points on a shape model of the workpiece; and a computing means which moves the third point with the first and second points as supporting points, and computes deformation of the shape model as the third point moves. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a workpiece deformation calculation apparatus and a workpiece deformation calculation method.

  In designing a part, it is necessary to appropriately design tolerances in consideration of an installation error when the designed part is attached to another part. As a part design technique that takes into account the attachment errors of parts, a CAD device disclosed in the following Patent Document 1 is known.

The CAD device of Patent Document 1 includes an operation model generation unit that sets a four-bar link mechanism model between two parts, and an operation analysis processing unit that performs a mechanism analysis of a four-bar link based on the four-bar link mechanism. According to the CAD device having such a configuration, it is possible to set the tolerance of the component in consideration of the mounting error of the component by using the four-bar linkage mechanism analysis method.
JP-A-7-287719

  However, the CAD apparatus has a problem that tolerance cannot be set with high accuracy because deformation such as twisting and bending of parts is not taken into consideration.

  As a technique for analyzing the deformation of a component, a deformation analysis method using a finite element method is known. However, in the analysis method using the finite element method, since a fine mesh is set for the part model, the deformation of the part can be calculated with high accuracy, but the calculation amount increases and the computational load on the computer increases. Increases and requires a lot of time for analysis.

  The present invention has been made to solve the above problems. Accordingly, an object of the present invention is to provide a workpiece deformation calculation apparatus and a workpiece deformation calculation method capable of calculating the deformation of a workpiece while suppressing the calculation load accompanying the analysis and reducing the time required for the analysis. .

  The above object of the present invention is achieved by the following means.

  The workpiece deformation calculation apparatus according to the present invention includes a setting unit that sets different first to third points on a workpiece shape model, and the third point is moved using the first and second points as fulcrums. And calculating means for calculating deformation of the shape model accompanying the movement of the third point.

  In the workpiece deformation calculation method of the present invention, the first to third points different from each other are set on the workpiece shape model, and the third point is moved using the first and second points as fulcrums. And calculating a deformation of the shape model accompanying the movement of the third point.

  According to the workpiece deformation calculation apparatus and the workpiece deformation calculation method of the present invention, the deformation of the shape model of the workpiece is calculated by geometric calculation based on the relative positional relationship between the first to third points. Can do. Therefore, the time required for analysis can be shortened.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. In addition, the same code | symbol was used for the same member in the figure.

  FIG. 1 is a block diagram showing a schematic configuration of a workpiece deformation calculation apparatus according to an embodiment of the present invention. The workpiece deformation calculation apparatus according to the present embodiment expresses a workpiece deformation phenomenon by an analysis model that moves the third point with the first and second points set on the workpiece shape model as fulcrums. The deformation of the workpiece is calculated from the geometric calculation.

  As illustrated in FIG. 1, the deformation calculation device 100 according to the present embodiment includes a CPU 110, a RAM 120, a ROM 130, a hard disk 140, a display unit 150, an input unit 160, and an interface 170. These units are connected to each other via a bus.

  The CPU 110 executes various calculations and controls on the three-dimensional shape model of the workpiece. The CPU 110 functions as a setting unit (setting unit) for setting different first to third points on the shape model of the workpiece. In addition, the CPU 110 moves the third point with the first and second points as fulcrums and calculates a displacement of the point on the shape model accompanying the movement of the third point (calculating means). Function. The specific processing contents of each unit will be described later.

  The RAM 120 temporarily stores the above-described shape model, and the ROM 130 stores a control program and the like in advance.

  The hard disk 140 functions as a storage unit (storage unit) that stores the displacement of points on the shape model calculated by the calculation unit. The hard disk 140 moves the third point with the first and second points as fulcrums, the setting program for setting the first to third points on the workpiece shape model, and the third point. The calculation program for calculating the displacement of the point on the shape model accompanying the movement of is stored.

  The display unit 150 is, for example, a liquid crystal display and a CRT display, and displays a workpiece shape model and the like.

  The input unit 160 is a pointing device such as a keyboard, a touch panel, and a mouse, for example. The interface 170 is used to receive a workpiece shape model from an external CAD device or the like.

  As described above, in the workpiece deformation calculation device according to the present embodiment configured based on the analysis model that moves the third point with the first and second points set on the workpiece shape model as fulcrums. The deformation of the workpiece is calculated.

  Next, with reference to FIG. 2, basic processing in the workpiece deformation calculation apparatus of the present embodiment will be described. FIG. 2 is a flowchart for explaining deformation calculation processing in the workpiece deformation calculation apparatus shown in FIG. Each process shown in the flowchart of FIG. 2 is executed by the CPU 110.

  First, in the deformation calculation process of the present embodiment, a shape model of a workpiece is read (step S101). Specifically, a workpiece shape model is read from an external CAD device via the interface 170. The read shape model is composed of a plurality of points, and the shape data is developed in the RAM 120.

  Next, first to third points are set on the shape model of the workpiece (step S102). Specifically, points on the workpiece that are set in advance according to the workpiece attachment procedure or the like are set as first to third points on the shape model. In the present embodiment, an attachment point for attaching a workpiece to another workpiece or a point in the vicinity of the attachment point is set as the first to third points.

  Then, the third point is moved with the first and second points as fulcrums, and the deformation of the shape model accompanying the movement of the third point is calculated (step S103). Specifically, the displacement of a plurality of points constituting the shape model of the workpiece is geometrically calculated by coordinate calculation as the displacement accompanying the movement of the third point. More specifically, for example, a vector indicating the moving amount and moving direction of the third point is applied to each point on the shape model so as to decrease toward the first and second points from the third point. By proportionally allocating, the displacement of the point on the shape model accompanying the movement of the third point is geometrically calculated. The points on the shape model from which the displacement is calculated are the number of points that can form at least the side of the workpiece, or the number of points that can recognize the deformation of a desired part of the workpiece.

  Next, the calculated displacement of the point on the shape model is stored (step S104), and it is determined whether there is a next first to third point (step S105). Then, the processes shown in steps S102 to S104 are repeated until the next first to third points disappear, and the process ends. The final shape model of the workpiece after deformation is displayed on the display unit 150 (step S106).

  As described above, according to the deformation calculation processing of the present embodiment, the deformation phenomenon of the workpiece is expressed by the analysis model that moves the third point by supporting the first and second points on the shape model. . And since the displacement of the point on the shape model is calculated from the geometric coordinate calculation based on the relative positional relationship between the first to third points, it affects the physical property value of the material constituting the workpiece and the workpiece. Unlike the finite element method in which the deformation of the workpiece is calculated in consideration of the force (stress) to be applied, the deformation of the workpiece can be calculated only from the shape data of the workpiece. Further, by adding the displacement calculated based on the next first to third points to the displacement of the point on the shape model calculated based on the current first to third points, Various deformations can be expressed by a combination of a plurality of analysis models.

  Hereinafter, the workpiece deformation calculation apparatus and the workpiece deformation calculation method of the present embodiment will be described in more detail by taking as an example the case of analyzing the tolerance of a cockpit module (hereinafter referred to as CPM) attached to the inside of an automobile.

  FIG. 3 is a perspective view showing a CPM subjected to tolerance analysis using the workpiece deformation calculation apparatus of the present embodiment. 3A is a front perspective view of the CPM in the present embodiment, and FIG. 3B is a rear perspective view of the CPM shown in FIG. 3A.

  As shown in FIG. 3, the CPM 200 according to the present embodiment includes a metal member part 210 as a skeleton member, and a resin part that covers the member part 210 and stores functional parts such as a speedometer and an acoustic device. 220. The member part 210 is made of, for example, steel, and the resin part 220 is made of polypropylene resin. In the resin part 220, the mounting holes G and H provided in the central part and the mounting holes I and J provided in both end parts are fixed to the corresponding mounting holes (not shown) of the member part 210 with bolts. Thus, the member part 210 is attached. The CPM 200 is provided with a plurality of mounting holes A, B, C, D, S, M, N, and O, and these mounting holes are sequentially engaged with corresponding mounting pins or bolts on the vehicle body side. Accordingly, the CPM 200 is attached to the vehicle.

  FIG. 4 is a diagram for explaining a deformation phenomenon of the CPM that occurs when the CPM shown in FIG. 3 is attached to the vehicle. As shown in FIG. 4, the CPM 200 attached to the vehicle includes a torsion between the member part 210 and the side brackets 211 and 212 (arrow 1 in FIG. 4) and bending toward the both ends from the center part of the CPM 200 (FIG. 4). Arrow 2) occurs. Further, the plastic part 220 of the CPM 200 is also bent (arrow 3 in FIG. 4).

  The twist of the CPM 200 indicated by the arrow 1 in FIG. 4 occurs when the mounting holes A to D provided in the side brackets 211 and 212 at both ends of the member part 210 are engaged with the mounting pins A ′ to D ′ on the vehicle side. In addition, this is caused by a positional shift on the actual vehicle between the positions of the mounting holes A to D and the positions of the mounting pins A ′ to D ′. In the bending of the CPM 200 indicated by the arrow 2 in FIG. 4, the mounting hole S provided in the steering post bracket extending downward from the central portion of the member portion 210 is fixed by the corresponding mounting hole S ′ on the vehicle side and the bolt. This occurs due to the positional deviation on the actual vehicle between the position of the mounting hole S and the position of the mounting hole S ′. Further, the bending of the resin part 220 indicated by the arrow 3 in FIG. 4 is caused by the attachment holes M, N, and O provided at the upper rear end of the resin part 220 being the attachment pins M ′, When engaging with N ′, O ′, it is caused by a displacement on the actual vehicle between the positions of the mounting holes M, N, O and the positions of the mounting pins M ′, N ′, O ′. .

  First, referring to FIGS. 5 and 6, when the mounting holes A to D provided in the side brackets 211 and 212 at both ends of the member part 210 are engaged with the mounting pins A ′ to D ′ on the vehicle side. A deformation calculation process for calculating the deformation of the generated CPM 200 will be described.

  FIG. 5 is a diagram showing a schematic shape model of the CPM shown in FIG. 3, and FIG. 6 shows the mounting holes provided in the side brackets at both ends of the member portion as mounting pins A ′ to D ′ on the vehicle side. It is a figure which shows the analysis model which calculates the deformation | transformation of CPM which arises when engaging with. In the mounting operation of the CPM 200 shown in FIG. 5 and FIG. 6, the mounting holes of the side bracket 212 in the state where the mounting holes A and B of the side bracket 211 are first engaged with the mounting pins A ′ and B ′ on the vehicle side. C and D are engaged with mounting pins C ′ and D ′ on the vehicle side. The shape model of the CPM 200 schematically shown is created in the actual shape of the CPM 200 shown in FIG.

  First, as shown in FIG. 5, center coordinates of attachment holes A and B (hereinafter referred to as attachment points A and B) are set as first and second points in the shape model of CPM 200, As a point, the coordinates (hereinafter referred to as a reference point F) of the end of the axis of the member part 210 located in the vicinity of the mounting holes C and D are set. A point corresponding to the axial center of the side bracket 212 is set as the target point K as the destination of the reference point F. Here, as the target point K, a coordinate position different from the reference point F is set in consideration of the positional deviation of the mounting hole and the mounting pin on the actual vehicle.

  Then, as shown in FIG. 6, the reference point F is moved to the target point K with the attachment points A and B as fulcrums (axes), and the displacement of the point on the shape model with the movement of the reference point F is calculated. Thus, the deformation of the workpiece is calculated. That is, the twist of the CPM 200 is expressed by an analysis model that moves the end of the member part 210 with the mounting holes A and B as fulcrums. Based on this analysis model, the deformed shape of the CPM 200 shape model is geometrically calculated. As described above, the displacement accompanying the movement of the reference point F of a plurality of points constituting the shape model is attached from the reference point K with the vector V that is the difference between the coordinates of the target point K and the coordinates of the reference point F. It is calculated by proportionally allocating so as to decrease toward points A and B. According to such a geometric calculation, as shown by the broken lines in FIG. 6, a plurality of the shape models are configured so that the amount of movement increases proportionally from the attachment points A and B toward the target point F. A deformed shape model obtained by moving the point is acquired.

  Next, a deformation calculation process for calculating the deformation of the CPM 200 that occurs when the CPM 200 is attached to the vehicle via the attachment hole S provided in the steering bracket of the member part 210 will be described with reference to FIG. FIG. 7 is a diagram showing an analysis model for calculating the deformation of the CPM that occurs when the CPM is attached to the vehicle through the attachment hole provided in the steering bracket at the center of the member part.

  In the analysis model shown in FIG. 7, an analysis model for moving the mounting hole S to the position of the vehicle-side mounting hole S ′ using the mounting holes A and B (center coordinates thereof) engaged with the mounting pin as a fulcrum, and the mounting hole By the analysis model that moves the attachment hole S to the position of the attachment hole S ′ with C and D as fulcrums, the bending that occurs from the central portion of the CPM 200 toward both ends is expressed. Then, the deformation of the CPM 200 is geometrically calculated based on two analysis models sharing the third point (the center coordinates of the mounting hole S).

  At this time, the displacement of the point on the shape model is calculated based on the coordinates of each point calculated by the analysis model shown in FIG. That is, the axial deformation of the CPM 200 is added to the shape model of the CPM 200 that shows a state in which the member portion 210 and the side brackets 211 and 212 are twisted. Therefore, in the analysis model shown in FIG. 7, the deformed shape of the CPM 200 is calculated in consideration of both the torsion between the member part 210 and the side brackets 211 and 212 and the bending of the CPM 200 in the left-right direction.

  Next, a deformation calculation process for calculating the deformation of the CPM that occurs when the CPM 200 is attached to the vehicle via the attachment holes M, N, and O provided at the upper rear end of the resin part 220 will be described with reference to FIG. To do. FIG. 8 is a diagram showing an analysis model for calculating the deformation of the CPM that occurs when the CPM is attached to the vehicle through the attachment hole provided at the upper rear end of the resin part.

  In the analysis model shown in FIG. 8, first, the mounting hole N is moved to the position of the mounting pin N ′ on the vehicle side with the mounting holes H and J (center coordinates thereof) mounting the resin part 220 to the member part 210 as fulcrums. The bending of the resin component 220 that occurs when the mounting hole N engages with the mounting pin N ′ is modeled by the analysis model to be performed. Similarly, the mounting hole M is attached to the mounting pin M by an analysis model in which the mounting hole M is moved to the position of the mounting pin M ′ on the vehicle side with the mounting holes I and G attaching the resin part 220 to the member part 210 as fulcrums. The bending of the resin part 220 that occurs when engaging with 'is expressed. Based on these two analysis models, the deformation of the CPM 200 is calculated. At this time, the calculation of the displacement of the point on the shape model is performed with reference to the coordinates of each point calculated by the analysis model shown in FIG.

  Next, the mounting hole O is attached to the mounting pin O according to an analysis model in which the mounting hole O is moved to the position of the mounting pin O ′ on the vehicle side with the mounting holes M and N engaged with the mounting pins M ′ and N ′ as fulcrums. The bending of the resin component 220 that occurs when engaging with O ′ is expressed. Based on this analysis model, the deformation of the CPM 200 is calculated. At this time, the displacement of the point on the shape model is calculated based on the displacement of each point calculated by the analysis model that moves the mounting holes M and N.

  As described above, according to the workpiece deformation calculation apparatus and workpiece deformation calculation method of the present embodiment described above, a plurality of points on the CPM 200 shown in Table 1 are set as the first to third points, respectively ( (See FIG. 9). As a result, the deformation of the CPM 200 attached to the vehicle through the plurality of attachment holes by combining a plurality of analysis models that move the third point (reference point) to the target point with the first and second points as fulcrums. The phenomenon can be expressed. A deformed shape of the CPM 200 is calculated by a geometric calculation based on the plurality of analysis models.

  And the deformation | transformation shape of the some shape model from which the position of the attachment hole was changed based on the tolerance analysis conditions set beforehand is calculated using the workpiece | work deformation | transformation calculation apparatus 100 of this Embodiment. The calculation results for a plurality of preset evaluation points (see 1 to 19 in FIG. 10) are processed so as to be within the reference value of the gap / surface difference between the CPM 200 and the peripheral parts, whereby the mounting holes of the CPM 200 Position tolerance is set. Since the tolerance analysis itself is the same as a general tolerance analysis based on statistical processing, a detailed description is omitted.

  FIG. 11 is a diagram showing the correlation between the CPM deformation analysis result using the workpiece deformation calculation method of the present embodiment and the deformation analysis result using the finite element method. The horizontal axis in FIG. 11 is a calculation result obtained by calculating the displacement amount of the plurality of evaluation locations of the CPM 200 when the vehicle is mounted using the finite element method, and the vertical axis indicates the displacement amount of the same evaluation location in the present embodiment. It is the calculation result calculated using the shape calculation method.

  As shown in FIG. 11, the calculation result using the finite element method and the calculation result using the shape calculation method of the present embodiment show a very high correlation and precision. In other words, according to the shape calculation method of the present embodiment, the finite element method and the finite element method can be obtained from only simple geometric calculation without considering the physical property value of the material constituting the CPM 200 and the force acting on the CPM 200. A shape analysis with the same degree of accuracy can be performed. Therefore, according to the workpiece deformation calculation apparatus and the deformation calculation method of the present embodiment, the deformation of the workpiece can be calculated with high accuracy while suppressing the calculation load accompanying the analysis and reducing the time required for the analysis. As a result, a tolerance analysis considering the deformation of the CPM 200 is realized.

  Further, according to the tolerance analysis in consideration of such an analysis model, the displacement amount M at a predetermined position of the CPM 200 and the displacement amount calculated from the tolerance analysis are compared with the general tolerance analysis in which the deformation of the workpiece is not considered. The accuracy rate of the ratio formula (1) that A is within 20% or less of the error is greatly improved.

| M−A | ≦ 0.2 × | M | +0.3 (measurement error) (1)
As described above, the described embodiment has the following effects.

  (A) The workpiece deformation calculation apparatus according to the present embodiment includes a setting unit that sets first to third points that are different from each other on the CPM shape model, and the third and third points as fulcrums. A calculation unit that moves the point and calculates deformation of the shape model accompanying the movement of the third point. Accordingly, since the deformation of the CPM shape model can be calculated by geometric calculation based on the relative positional relationship between the first to third points, the time required for the analysis can be shortened. . More specifically, since the deformation of the CPM can be calculated by a geometric calculation that does not take into account the physical property value of the material constituting the CPM and the force acting on the CPM, the deformation analysis using the finite element method is possible. However, it is possible to obtain a highly accurate calculation result equivalent to that of the finite element method while suppressing the calculation load associated with the analysis and reducing the time required for the analysis.

  (B) The CPM shape model is composed of a plurality of points, and the calculation unit outputs a vector indicating the movement amount and movement direction of the third point from the third point to the first and second points. By allocating proportionally to a plurality of points on the shape model so as to decrease, the displacement of the points on the shape model is calculated. Accordingly, it is possible to calculate a plurality of displacements of points on the shape model accompanying the movement of the third point by simple geometric coordinate calculation.

  (C) The first and second points are attachment points (attachment holes) for attaching the CPM to the vehicle, and the third point is a state of being attached to the vehicle at the first and second points. Another attachment point for attaching the CPM to the vehicle at a different position or a point in the vicinity of the other attachment point. Therefore, since the deformation of the CPM is calculated by the analysis model with the two attachment points where the CPM is attached to the vehicle as fulcrums, the deformation of the CPM can be calculated with high accuracy.

  (D) The workpiece deformation calculation apparatus according to the present embodiment further includes a storage unit that stores the displacement of the points on the shape model calculated by the calculation unit, and the setting unit stores the points on the stored shape model. The following first to third points are set on the deformed shape model of the CPM calculated from the displacement of the following, and the calculation unit uses the deformed shape model as a reference and the following first and second points. Is used as a fulcrum to calculate the displacement of the point on the deformed shape model accompanying the movement of the next third point. Therefore, the deformation of the CPM that occurs when the CPM is attached to the vehicle at a plurality of attachment points can be expressed by combining a plurality of analysis models.

  (E) A setting part sets the following 1st-3rd point according to the attachment order of the some attachment point provided in the said CPM, in order to attach CPM to a vehicle. Therefore, since the deformation of the CPM can be sequentially calculated according to the procedure for attaching the CPM to the vehicle, the calculation accuracy of the deformation shape of the CPM is improved.

  (F) The CPM is composed of a plurality of members made of different materials. Therefore, even when the CPM is composed of a plurality of members having different physical properties, the physical properties of the plurality of members can be obtained by using an analysis model that moves the third point with the first and second points as fulcrums. The deformation shape of the CPM can be calculated in a short time without considering the difference in values. Further, even when the number of members having different physical properties constituting the CPM increases, the deformed shape of the CPM can be calculated in a short time regardless of the number of members having different physical properties.

  (G) The CPM is composed of a metal member part and a resin part. The first and second points are attachment points for attaching the resin part to the member part, and the third point is This is an attachment point for attaching the CPM to the vehicle. Therefore, since the deformation of the resin part is calculated by the analysis model using the two attachment points at which the resin part is attached to the metal member, the deformation of the resin part can be calculated with high accuracy.

  (H) The workpiece deformation calculation method according to the present embodiment includes a step of setting different first to third points on the CPM shape model, and a third point using the first and second points as fulcrums. And calculating a deformation of the shape model accompanying the movement of the third point. Accordingly, since the deformation of the CPM shape model can be calculated by geometric calculation based on the relative positional relationship between the first to third points, the time required for the analysis can be shortened. .

  As described above, in the above-described embodiment, the workpiece deformation calculation device and the workpiece deformation calculation method according to the present invention have been described. However, it goes without saying that the present invention can be appropriately added, modified, and omitted by those skilled in the art within the scope of the technical idea.

  For example, in the CPM tolerance analysis in the above-described embodiment, a plurality of analysis models are combined to express the deformation phenomenon of the workpiece when the CPM is attached to the vehicle. However, it is not always necessary to apply a plurality of analysis models, and only one analysis model may be applied. Even when one analysis model is applied, the analysis accuracy is greatly improved as compared with the tolerance analysis that does not consider the deformation of the CPM.

  In the above-described embodiment, the case where the deformation of the CPM is calculated has been described as an example. However, the workpiece deformation calculation apparatus and the deformation calculation method of the present invention are not limited to the CPM deformation calculation, and can be applied to various workpiece deformation calculations.

It is a block diagram which shows schematic structure of the workpiece deformation calculation apparatus in one embodiment of this invention. It is a flowchart for demonstrating the deformation | transformation calculation process in the workpiece | work deformation | transformation calculation apparatus shown in FIG. FIG. 2 is a perspective view showing a CPM subjected to tolerance analysis using the workpiece deformation calculation apparatus shown in FIG. 1. It is a figure for demonstrating the deformation | transformation of CPM which arises when attaching CPM shown in FIG. 3 to a vehicle. It is a figure which shows the schematic shape model of CPM shown in FIG. It is a figure which shows the analysis model which calculates the deformation | transformation of CPM which arises when the attachment hole provided in the side bracket of the both ends of a member part is engaged with the attachment pin by the side of a vehicle. It is a figure which shows the analysis model which calculates the deformation | transformation of CPM which arises when attaching CPM to a vehicle with the attachment hole provided in the steering bracket of the center part of a member part. It is a figure which shows the analysis model which calculates the deformation | transformation of CPM which arises when attaching CPM to a vehicle with the attachment hole provided in the back upper end of resin parts. It is a figure for demonstrating the some analysis model used in order to calculate the deformation | transformation of CPM shown in FIG. It is a figure which shows an example of the tolerance evaluation location of CPM shown in FIG. It is a figure which shows the correlation with the deformation | transformation analysis result of CPM using the workpiece | work deformation | transformation calculation method of this Embodiment, and the deformation | transformation analysis result using a finite element method.

Explanation of symbols

100 workpiece deformation calculation device,
110 CPU,
120 RAM,
130 ROM,
140 hard disk,
150 display section,
160 input section,
170 interface,
200 cockpit module,
210 Membership,
220 Resin parts.

Claims (8)

Setting means for setting different first to third points on the shape model of the workpiece;
And calculating means for calculating the deformation of the shape model accompanying the movement of the third point while moving the third point with the first and second points as fulcrums. Work deformation calculator. The shape model of the workpiece is composed of a plurality of points,
The calculation means includes a plurality of points on the shape model so that a vector indicating a movement amount and a movement direction of the third point decreases from the third point toward the first and second points. The workpiece deformation calculation apparatus according to claim 1, wherein the displacement of a plurality of points on the shape model is calculated by proportionally distributing to the shape model.   The first and second points are attachment points for attaching the workpiece to another workpiece, and the third point is attached to the other workpiece at the first and second points. The workpiece deformation calculation apparatus according to claim 1, wherein the workpiece deformation calculation device is another attachment point for attaching the workpiece in a state to the other workpiece at a different position or a point in the vicinity of the other attachment point. Storage means for storing a displacement of a point on the shape model calculated by the calculation means;
The setting means sets the following first to third points on the shape model after deformation of the workpiece calculated from the displacement of the points on the stored shape model,
The calculation means uses the deformed shape model as a reference, uses the next first and second points as fulcrums, and calculates points on the deformed shape model as the next third point moves. The workpiece deformation calculation apparatus according to claim 2, wherein the displacement is calculated.   The said setting means sets the following 1st-3rd points according to the attachment order of the some attachment point provided in the said workpiece | work in order to attach the said workpiece | work to another workpiece | work. Item 5. A workpiece deformation calculation apparatus according to Item 4.   The workpiece deformation calculation apparatus according to claim 1, wherein the workpiece is composed of a plurality of members made of different materials. The workpiece is composed of first and second members made of different materials,
The first and second points are attachment points for attaching the second member to the first member, and the third point is an attachment point for attaching the workpiece to another workpiece. The workpiece deformation calculation apparatus according to claim 6, wherein the workpiece deformation calculation device is provided. Setting different first to third points on the shape model of the workpiece;
Moving the third point with the first and second points as fulcrums, and calculating deformation of the shape model accompanying the movement of the third point. Deformation calculation method.

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